GRAPTOLITES OF AUSTRALIA 
43 
D. quadrimucronatus, D. calcaratus, Leptograptus flaccidus, 
Climacograptiis bicornis var. tridentatus, C. tuhuliferus, 
Dicellograptus morrisi, D. gurleyi, Gryptograptus tricornis, 
Nemagraptus gracilis and Lasiograptus margaritatus. 
F. Chapman and E. W. Skeats (85) published what is 
largely a duplication of Chapman’s paper (82) on the 
hy droids from North Monegeeta. They state that somewhat 
similar branching forms occur with Dinesiis ida and other 
trilobite remains probably of Cambrian age near Heathcote, 
30 miles to the north. 
1920. — T. S. Hall (86) added to his list (63) of the Upper 
Ordovician forms from Tolwong (vide 159 post), New South 
Wales, Leptograptus flaccidus, Dicellograptus complanatus 
et var. ornatus, D. morrisi, D. cf. caduceus, Dicranograptus 
ramosus var. semispinifer, D. hians, Climacograptiis caudatus 
var. wellingtonensis, C. cf. tuhuliferus, Diplograptus theilei, 
D. linearis, Glossograptus sp., Lasiograptus (Neurograptus) 
cf. fibratus, ( ?) Retiograptus geinitzianus and Hetiolitidae 
fragt. He added notes on Diplograptus (M.) linearis, Clima- 
cograptus tubuliferus and C. caudatus var. wellingtonensis. 
R. A. Keble (87) described and figured Tetragraptus 
approximatus Nich., T. acclinans sp. nov. and T. decipiens 
T. S. Hall. 
A. V. James (88) gives Upper Ordovician and Silurian 
graptolite localities on his map of the Bulla-Sydenliam area 
in addition to those indicated on Quarter Sheets 1 NW., 7 SE. 
No specific detei*minations of the graptolites he obtained 
from them are given. 
1921. — L. F. Harper (89) recorded from Yalgogrin, New 
South Wales, Climacograptus hastatus, Dicellograptus cf. 
affinis and fragmentary forms comparable with D. caduceus. 
W. J. Harris and W. Crawford (90) published lists of 
graptolites obtained from numerous specified localities in the 
Gisborne District. They represent collections from the 
Bendigo, Castlemaine and Darriwil Series and the Upper 
Ordovician. Dicellograptus smithi was recorded for the first 
time in Victoria. 
A tentative recognition of three Upper Ordovician grapto- 
lite zones was proposed: 
1. Diplograptus-Didymograptus Zone (lowest). 
2. Dicellograptus Zone. 
3. Dicranograptus Zone. 
They stated that the Riddell Grits overlie the Dicrano- 
graptus shales (Upper Ordovician) and they underlie the 
